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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1998 2
2000 1
2001 1
2004 1
2005 1
2009 1
2021 0
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Page 1
What Good Are Positive Emotions?
Fredrickson BL. Fredrickson BL. Rev Gen Psychol. 1998 Sep;2(3):300-319. doi: 10.1037/1089-2680.2.3.300. Rev Gen Psychol. 1998. PMID: 21850154 Free PMC article.
The Undoing Effect of Positive Emotions.
Fredrickson BL, Mancuso RA, Branigan C, Tugade MM. Fredrickson BL, et al. Motiv Emot. 2000 Dec;24(4):237-258. doi: 10.1023/a:1010796329158. Motiv Emot. 2000. PMID: 21731120 Free PMC article.